British Prime Minister Theresa May promised to respond to any Russian aggression after she expelled 23 Russian diplomats in retaliation for the poisoning of dissident Sergei Krypal and his daughter Yulia earlier this month. "Last night, I saw the Russian ambassador being quoted as saying that Russia was not a country that accepted ultimatums. Well I can say that the United Kingdom is not a country that accepts threats, and we will stand up against them," May said.